Chelsea Therapeutics (UNKNOWN:CHTP.DL) left investors stunned today after taking a steep tumble. Shares dropped almost 30% after the Food and Drug Administration (FDA) posted briefing documents ahead of an advisory committee meeting for Chelsea's drug Northera. The meeting is scheduled for next week, but what did the market see in today's release? Analysts David Williamson and Max Macaluso discuss the details in the video below.